One idea could be that the boggart in the wardrobe has a hidden past that is related to an ancient magic. For example, it was once a guardian of a powerful artifact but was cursed and trapped in the wardrobe. The characters in the fan fiction could discover this and try to break the curse.
Maybe the boggart in the wardrobe is not really a malevolent being. It could be that it's just scared and using its shape - shifting ability to protect itself. The story could revolve around a character befriending the boggart and helping it find a new home outside of the wardrobe.
Another plot idea is that the boggart in the wardrobe is part of a series of tests for a young wizard or witch. The wardrobe could be a magical portal that leads to different challenges. Each time the boggart appears in a different form, it represents a different trial that the protagonist must overcome in order to gain a certain magical ability or knowledge.
A character might use a powerful charm like the Patronus charm. Since the Patronus is a positive and powerful form of magic, it could potentially drive away the boggart. However, this might be a more difficult option as the Patronus charm requires a lot of concentration and a strong, positive emotion.
A possible plot is that the boggart takes the form of a combined fear for both of them. It could be a powerful dark wizard who has enslaved the wizarding world, and only Hermione and Draco, with their combined knowledge and skills, can defeat it. As they face this boggart, they learn to trust each other more than they ever thought possible.
A fan fiction plot could revolve around exploring the backstories of some of the minor characters in Castleavnia. For example, you could write about a character's life before they became involved in the main events of the Castleavnia world, their family, and what led them to their current situation.
One idea could be a long - lost relative of a main character suddenly arriving in the village. This new character could bring a lot of mystery and secrets with them. Maybe they have a claim to some property in Emmerdale which causes disputes among the locals.
One idea could be exploring what would happen if the Pearson family went on a trip around the world together. They could face various cultural clashes and personal growth moments during the journey.
One idea could be Yzma getting a chance to redeem herself. Maybe she accidentally discovers a new magic that can reverse all the bad things she's done in the past and she has to decide whether to use it for good or for her own gain.
Another plot might involve Yennefer and Geralt having to deal with a magical curse that affects their relationship in unexpected ways. For example, they might switch bodies and have to understand each other's struggles better. In the world of Witcher fan fiction, the possibilities are really endless. Writers can take the existing lore and twist it to create engaging stories.
One idea could be a story where a young, ordinary person discovers they have a hidden power related to a lesser - known Marvel character. For example, they find out they can communicate with Lockjaw, the Inhumans' teleporting dog, and this ability leads them on an adventure across different Marvel universes.
One idea could be that the Goonies find an ancient map leading to a lost underwater city. They then have to build a special submarine to reach it. Along the way, they face new villains who also want to claim the treasures of the underwater city.
One idea could be a time - travel plot where a modern - day vampire hunter travels back to the world of Dracula 3000. They could use their knowledge of modern technology and vampire lore to try and stop Dracula from achieving his evil plans. Maybe they bring a UV light gun or something.